#171B66#171B66

#171B66 is a dark, vivid blue. Relative luminance 0.019; OKLCH L 27.9% C 0.128 H 272.2°. Best body text is #FFFFFF at 15.16:1 contrast (WCAG AA passes).

Color values

HEX	#171B66
RGB	rgb(23, 27, 102)
HSL	hsl(237, 63%, 25%)
HSV	hsv(237, 77%, 40%)
CMYK	cmyk(77.5%, 73.5%, 0%, 60%)
CIE-LAB	lab(15.09, 26.48, -44.31)
CIE-LCH	lch(15.09, 51.62, 300.86°)
OKLab	oklab(27.9% 0.005 -0.1282)
OKLCH	oklch(27.9% 0.128 272.2)
XYZ	xyz(3.1427, 1.9250, 12.7737)
Luminance	0.0192 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#171B66 #666217

analogous

#174366 #171B66 #3B1766

triadic

#171B66 #66171B #1B6617

tetradic

#171B66 #661743 #666217 #17663B

square

#171B66 #661743 #666217 #17663B

split-complementary

#171B66 #663B17 #436617

monochromatic

#060719 #0C0E34 #171B66 #222898 #2E35CA

Accessibility & contrast

On white

15.16

#171B66 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.39

#171B66 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #171B66

15.16:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##171B66	#FFFFFF	#000000	##FFFFFF
##171B66	1.00	15.16	1.39	15.16
#FFFFFF	15.16	1.00	21.00	1.00
#000000	1.39	21.00	1.00	21.00
##FFFFFF	15.16	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002A68

Deuteranopia (green-blind)

#002265

Tritanopia (blue-blind)

#00303E

Achromatopsia (no color)

#262626

Design tokens & code

CSS

--color: #171b66;
/* rgb */ color: rgb(23, 27, 102);
/* oklch */ color: oklch(27.9% 0.128 272.2);

Tailwind

colors: {
  custom: {
    50: '#625792',
    500: '#171b66',
    950: '#000000',
  },
}

SCSS

$custom: #171b66;
$custom-light: #625792;
$custom-dark: #000000;

JSON

{
  "hex": "#171b66",
  "rgb": {
    "r": 23,
    "g": 27,
    "b": 102
  },
  "hsl": {
    "h": 236.962,
    "s": 63.2,
    "l": 24.51
  },
  "oklch": {
    "l": 0.27896,
    "c": 0.12826,
    "h": 272.2
  },
  "luminance": 0.01925
}

Semantic roles & 50–950 ramp

primary

#171B66

secondary

#9C983C

accent

#DE42E6

background

#F6F5F9

surface

#EBE9F1

border

#C6C5CB

text

#06030D

muted

#7A787E

Preview Lab

Preview with #171B66

Body copy rendered with the generated semantic roles for this colour.

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